Investments in Unconsolidated Real Estate Partnerships (Details Textual) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
Property
|
Dec. 31, 2011
Property
|
Dec. 31, 2010
Property
|
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Schedule of Equity Method Investments [Line Items] | |||
Number of properties owned by unconsolidated real estate partnerships | 22 | 123 | 173 |
Aggregate investment in unconsolidated partnerships | $ 18.7 | $ 47.8 | |
Excess of equity method investment aggregate cost over share of underlying historical partners deficit | $ 6.9 | $ 46.5 | |
Maximum [Member]
|
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Schedule of Equity Method Investments [Line Items] | |||
Range of ownership interests in unconsolidated real estate partnerships | 67.00% | ||
Minimum [Member]
|
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Schedule of Equity Method Investments [Line Items] | |||
Range of ownership interests in unconsolidated real estate partnerships | 5.00% |